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Reports usages of concrete classes, rather than interfaces.
Such declarations may represent a failure of abstraction and may make testing more difficult.
<p>
Declarations whose classes come from system or third-party libraries will not be reported by this inspection.
Casts, instanceofs, and local variables are not reported in <code>equals()</code> method implementations.
Also, casts are not reported in <code>clone()</code> method implementations.
</p>
<p>Example:</p>
<pre><code>
  interface Entity {}
  class EntityImpl implements Entity {}

  void processObject(Object obj) {
    // warning: instanceof of the concrete class
    if (obj instanceof EntityImpl) {
      // warning: cast to the concrete class,
      // rather than the interface
      processEntity((EntityImpl)obj);
    }
  }
  // warning: parameter of concrete class
  void processEntity(EntityImpl obj) {
  }
</code></pre>
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<p>
  Use the <b>Ignore abstract class type</b> option to ignore casts to abstract classes.</p>
<p>Use the subsequent options to control contexts where the problem is reported.</p>
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